Passage 4.34.2
διάφοροι δὲ τὸ εἶδος μάλιστα ἰχθῦς ἀναθέουσιν ἐς τὸν Πάμισον ἅτε ἐς ὕδωρ καθαρὸν καὶ οὐ κατὰ τὰ αὐτὰ τοῖς κατειλεγμένοις ποταμοῖς ἰλυῶδες· οἱ κέφαλοι δέ, ἅτε ἰχθύων ὄντες τῶν πηλαίων, ποταμῶν φίλοι τῶν θολερωτέρων εἰσί. θηρία δὲ ἐς ὄλεθρον ἀνθρώπων οὐ πεφύκασιν οἱ Ἑλλήνων ποταμοὶ φέρειν, καθάπερ γε Ἰνδὸς καὶ Νεῖλος ὁ Αἰγύπτιος, ἔτι δὲ Ῥῆνος καὶ Ἴστρος Εὐφράτης τε καὶ Φᾶσις· οὗτοι γὰρ δὴ θηρία ὅμοια τοῖς μάλιστα ἀνδροφάγα αὔξουσι, ταῖς ἐν Ἕρμῳ καὶ Μαιάνδρῳ γλάνισιν ἐοικότα ἰδέας πλὴν χρόας τε μελαντέρας καὶ ἀλκῆς· ταῦτα δὲ αἱ γλάνεις ἀποδέουσιν.
Fish of unusually varied appearance ascend the Pamisus, since its waters are clear and differ from those of the aforementioned rivers, whose streams are muddy. Grey mullets, however, being fish that prefer muddy habitats, favor rivers whose waters are cloudier. Greek rivers by nature do not produce wild animals destructive to humans, as do the rivers of India and the Egyptian Nile, as well as the Rhine, the Danube, the Euphrates, and the Phasis. These indeed nurture animals that are among the most dangerous man-eaters, resembling the catfish found in the Hermus and Maeander rivers in shape, but considerably darker in color and greater strength—qualities in which the catfish are lacking.